The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 2005
Filed:
Oct. 16, 2002
Hiroyuki Kuriyama, Kanagawa, JP;
Yasushi Miura, Kanagawa, JP;
Masashi Shimizu, Kanagawa, JP;
Chikanobu Ikeda, Tokyo, JP;
Shigeru Watanabe, Kanagawa, JP;
Hiroyuki Kuriyama, Kanagawa, JP;
Yasushi Miura, Kanagawa, JP;
Masashi Shimizu, Kanagawa, JP;
Chikanobu Ikeda, Tokyo, JP;
Shigeru Watanabe, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A printing apparatus and an ink-discharge status detection method which perform appropriate print control by detecting discharge failure with a simple construction, without reducing the printing speed. The apparatus, to which the method is applied, performs test ink discharge from a part of nozzles of a printhead while scanning the printhead, and detects ink discharge statuses of the nozzles of the printhead by using a photosensor in an area between the home position of the printhead and a position outside of an effective printing area. In next detection, nozzles different from those used in the previous test ink discharge are used for performing test ink discharge, and discharge statuses are detected. Discharge statuses of all the nozzles are detected in forward and backward scannings or a plurality of scannings.